SU1470932A1 - Ejector-type core tool - Google Patents

Abstract

The invention relates to the mining industry and is intended for flushing boreholes. The goal is to increase the efficiency of washing wells. For this, the system of forward and reverse flow channels is made in the form of axial 4, lateral 8 and peripheral 7 channels. In channel 4 posted ejector. The gear has a valve 12 installed in the diffuser 11 and configured to allow the valve body 6 to pass through the saddle 13 with an increase in pressure in the drill pipe string 9. In the channels 7, throttling assemblies are installed that create an increased pressure during forward circulation as compared to the reverse unchanged performance. The flushing fluid enters the diffuser, and from it through the channel 8 into the annulus of the well. Here, this fluid flow splits into two parts. One of the parts in the drilling process washes the core pipe 1, picks up the drill cuttings formed in the process of deepening. Further, this part of the fluid rises along the annular gap between the core and the inner surface of the pipe 1 into the lower cavity. From the latter, the liquid is sucked to the channels 7, and after passing through them, it enters the upper cavity, and from it into the diffuser 11. Then the cycle repeats. 2 Il.

Description

one

The invention relates to the mining industry, in particular to well flushing devices, and can be used for organizing (direct flushing followed by a reverse circulation of the washing liquid.

The purpose of the invention is to increase the efficiency of the washing of wells. , FIG. 1 depicts an ejector column projectile during direct circulation; FIGS. -2 are the same with reverse circulation.

The ejector column device includes a coring tube with a crown 2, a flow distribution unit, a flow fluid, a switch for directing the flow of washing fluid, and an ejector.

The flow distribution unit of the washing liquid is made in the form of an adapter 3, having an axial channel 4 with a nest 5 for a waste lock body 6, peripheral channels 7 and a side channel 8, the diameter of which exceeds the dimensions of the waste lock body 6 (in this case the ball was used as a lock body 6 ). The adapter 3 consists of two interconnected parts and serves to connect the core pipe 1 with a column pipe 9..,

The ejector is designed as a nozzle.

10, mounted in the upper part of the adapter 3 in the axial canap 4 with shear pins and diffuser

11, having a cylindrical part and a diffuser (i.e. conical) part.

five

0

five

0

five

0

interconnected by thread.

In the upper part of the diffuser 11, there is a switch for the direction of flow of the washing liquid, made in the form of a valve 12 installed in the cylindrical part of the diffuser 11, discharging its diffuser part. The valve 12 consists of a saddle 13 and a waste valve 6 and is adapted to pass through the saddle 13 of the valve 6 when the pressure pipes in the drill pipe 9 are increased. In this saddle 13, the valve 13 is made elastic by using an elastic material, rubber, to make it.

The parts of the adapter 3 are interconnected by means of the nozzle 14. As a result, two cavities are formed: the upper and the lower, interconnected with each other. The peripheral channels 7 in the distribution node of the washing liquid flow,

The upper part of the adapter 3 is made in the form of a nozzle 15 having side windows 16. In the lower part of the nozzle 15 enters the upper part of the diffuser 11, fixed in it with shear pins 17. The bottom of the diffuser 11 enters the lower part of the adapter 3.

In the upper part of the peripheral channels 7, throttling nodes 18 are installed, made in the form of elastic chokes, for example of rubber (sheet rubber with notches from the axis to the edges).

The throttling nodes 18 are configured to create an increased

3U

pressure during direct circulation compared to reverse pressure with constant performance

The ejector columnar works in a following way.

After the drilling tool is lowered into the well, the income to the sludge deposit 5-6 m is not included, and the mud pumps are turned on. The injected flushing fluid passes through the nozzle 10, the side windows 16 of the nozzle 15, the upper cavity, the peripheral channels 7 and enters the lower cavity (the column pipe 1). Washing the bottom of the well and the end of the crown 2, the fluid washes away the sediment on the bottom and through the lance gap between the walls of the well and the outer walls of the core pipe 1 and the drill pipes 9, brings it to the surface. In this way, a direct rinsing of the well is carried out and downhole sediment is washed out with the rotation of the drilling tool. After reaching the bottom of the well and PECH it completely from the sediment, transfer the flushing to reverse circulation.

To do this, increase the flow of flushing fluid so that the pressure drop over the waste valve 6 increases by 30-40 kgf / cm. Under force from the increased pressure, the locking organ 6 expands the elastic saddle 13, passes the diffuser 11 and sits in the socket 5, thereby blocking the axial channel of the adapter 3V

Since the diffuser 11 is released from the valve 12, the ejector comes into operation, and from that moment the direct flush is switched to the reverse one. This moment at the top is signaled by a decrease in pressure, for example, by 20-30 kgf / cm. The flushing fluid exiting the nozzle 10, due to the velocity head, sucks the flushing fluid from the upper cavity from the upper cavity and enters the diffuser 11, and from it through the side channel 8 into the annulus of the well (FIG. 2). Here the fluid flow is split in two: most of it goes up the 3aTpy6HONry space, and the other part goes down. This part of the flow in the course of the turbulence washes the columnar

pipe 1, the crown 2, picks up the drill cuttings formed during the recessing process, and along the annular gap between the core and the inner surface of the core pipe 1 rises into the lower cavity, from where it is sucked into the peripheral channels 7, and after passing through them, it falls into the upper cavity. From the upper cavity, the liquid is picked up by the velocity pressure of the jet leaving the nozzle 10 and enters the diffuser 11. Then the cycle repeats.

The drilling mode of the proposed core pipe is normal.

After lifting the core set to the surface and removing the raised core, the core tube 1 is tilted and the locking member (ball) 6 rolls out through the side channel 8. The helix tube 1 is lowered into the well and the locking organ (ball) 6 is thrown from above, which sits in saddle 13. As a result, the ejector columnar is prepared for the next flight.

Claims (1)

Invention Formula An ejector core projectile, including an ejector in the form of a nozzle and a diffuser, a flow distribution unit, made in the form of an adapter with a system of forward and reverse flow channels, connecting the core pipe to the drill pipe, a flow direction switch, made in the form of a valve from the saddle and reject valve, characterized in that, in order to increase the efficiency of flushing of wells, the system of channels of direct and reverse flows is made in the form of axial, lateral and peripheral channels, the ejector p The valve is located in the axial channel, the valve is installed in the diffuser and is designed to allow the valve body to pass through the seat with increasing pressure in the drill string, and in the peripheral channels there are throttle assemblies made with the possibility of creating increased pressure during direct circulation compared to reverse with constant performance. Ш.2